Grate for furnaces



R. w. & 0. DAVIS. Grate.

Wzzna 5 e5 .No. 54,064. Patent ed April 17. 1866.

UNITE STATES ROBERT W. DAVIS, OF FLUSHING, AND DANIEL DAVIS, OF LONGISLAND CITY, ASSIGNORS TO THEMSELVES AND JOHN H. LIVINGSTON, OF LONGISLAND CITY, NEW YORK.

GRATE FOR FURNACES, 81.0.

Specification forming part of Letters PatentNo. 54,064, dated April 17,1866.

To all whom it may concern.-

Be 1t known that we, ROBERT WINSLOW DAVIs, of Flushing, in the county ofQueens and State of New York, and DANIEL DAVIS, of Long Island city, inthe same county and State, have invented certain new and usefulImprovements in Grates for Furnaces and Stoves; and we do hereby declarethe following to be a full, clear, and exact description of the same,reference being had to the annexed drawings, making a part of thisspecification, in which Figure l is a plan view of the grate alone. Fig.2 is a central vertical section, showing the invention as applied to avertical steam-boiler. Fig. 3 is a detached sectional view of a portionof the apparatus.

Similar letters of reference indicate corresponding parts in the severalfigures.

Although represented in the drawings as applied to the furnace of asteam-boiler, my invention is equally applicable to base-burnin gstoves.

It consists in a novel construction of a firegrate with bars radiatingfrom a common center, and having such a curvature in vertical planes asto give the grate the form of a basket,

and give the intervening spaces between the said bars agreatly-increased length as compared with the length of the barsmeasured directly in a horizontal plane, and thereby to give a verylarge area of air-passage between the said bars as compared with thehorizontal area of the grate.

It also consists in supporting the grate of a furnace or stove upon acentral screw, upon which only it can be lowered out of the furnace orfire-box for the purpose of removing clinkers or other refuse ofcombustion.

To enable those skilled in the'art to understand the construction andoperation of my invention, I will proceed to describe it with referenceto the drawings.

Gris theIgrate, circular inform, and situated below the vertical boileror beneath the body of the base-burning stove, as the case may be.

Z representsthe position with regard to the grate of the fuel-reservoir,formed within the said boilerffior within the body of the stove, andthrough which the fuel passes to the grate. I shows the annular fluethat carries off the products of combustion. The furnace E is circularin shape, so as to conform to the periphery of the grate G,'which isplaced therein when in use. This grate is composed of bars 8, whichradiate from a central ring, a, and between which are formed radialspaces r. These bars are curved downward as they approach the sides ofthe furnace and then turn upward at their outer ends, which are unitedby an annular rim situated at the same height as the ring a. Thispeculiar concave shape of the bars gives them and the spaces 1" betweenthem a length very much greater than the width of the grate measured ina horizontal direction, and in this way provision is afforded for agreater supply of air through the grate than if the bars were straight.I The grate thus constructed has the character of a basket, which may belowered vertically out of the furnace E for the removal of the clinkersor such refuse from the fuel as cannot be raked between the bars by theinsertion of prickers or other stokin g-irons under the bed-plate 0.Before thus lowering the grate the fuel should all, as near as possible,be consumed.

This grate is supported by a yoke, P, which has in its central hub orboss a screw-thread which fits to a vertical fixed screw, 3, the lowerend of which is screwed into the horizontal brace Q, which is attachedto the standards D D, or any other fixed support. The said yoke, ofwhich Fig. 3 is a plan View, has three or more radial arms, to, on whichthere are vertical ribs which enter the spaces r 4" between thegrate-bars, so as to compel the grate to turn with it upon the screw 3,for the purpose of being raised and lowered into and from the furnace.

On the top of the screw there is firmly secured a small stationarygrate, R, of a form resembling a cog-wheel, and of an externalcircumference, to fit to the inside of the ring a, which forms themiddle portion of the grate G. The upper part of this central grate, R,is

level with the surrounding portion of the grate Gr when the latter is upto its proper operating level, above which it is prevented from risingeither by the yoke P coming in contact with a stop upon the screw S orby the thread of the screw being cut away to a proper height. Under thegrate there is an ash-pan, T.

When it is desired to take out clinkers or other refuse the grate G isrevolved around the screw S until it is brought sufficiently low down toadmit of their removal by any suitable means.

What we claim as new, and desire to secure by Letters Patent, is-

1. The grate G, constructed and applied to a

